Medium format? What does this "medium format" mean? I ask because if you're going to shoot roll film (formats 6x6, 6x7, 6x9) it may be better to use a medium format system camera than a 4x5 view camera with a roll holder. If you mean 4x5, re-calibrate your concept of medium format.
More seriously, if Intrepid holds the price to 200 UKP at today's rates that'll be around $250 plus shipping. You can't get any other new 4x5 field camera for that little. But you can get used 4x5 monorails with Graflok backs for less. I have a Cambo so don't follow Sinar prices but understand they're low too.
About lenses, look on ebay.com. Click on lenses, then on type of camera, select large format and browse. There are many modern lenses from, in alphabetical order, Fuji, Nikon, Schneider and Rodenstock of focal lengths from 150 to 210 mm that will fit your budget. Impossible to make a bad mistake with any of them that's in good order, but note that newer lenses (all but it) are somewhat preferable to convertible Symmars. Somewhat.